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    SubjectRe: [PATCH] Posix file attribute support on VFAT
    Date
    Hiroyuki Machida <machida@sm.sony.co.jp> wrote:

    > For newly created and/or modified files/dirs, system can utilize
    > full posix attributes, because memory resident inode storage can
    > hold those. After umount-mount cycle, system may lose some
    > attributes to preserve VFAT format.

    Inodes may be reclaimed, therefore you might also lose some attributes at
    runtime. For your users, that will look like a heisenbug. A similar bug
    has been reported for procfs. Is your implementation affected?

    > - Special file
    >         To distinguish special files, look if this fat dir entry
    >         has ATTR_SYS, first. If it has ATTR_SYS, then check
    >         1st. LSB bit in ctime_cs, refered as "special file flag".
    >         If set,  this file is created under VFAT with "posix_attr". 
    >         Look up TYPE field to decide special file type.
    >         This spcial file detection mothod has some flaw to make
    >         potential confusion. E.g. some system file created under
    >         dos/win may be treated as special file.  However in most case,
    >         user don't create system file under dos/win.

    You can add additional magic, e.g.: nodes must be empty, except for symlinks
    which must be not larger than 4KB (current PATH_MAX?). This will get rid
    of io.sys, logo.sys etc.\. If you want to be really sure, prepend a magic
    code to the on-disk representation of symlinks.

    --
    Ich danke GMX dafür, die Verwendung meiner Adressen mittels per SPF
    verbreiteten Lügen zu sabotieren.
    -
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